Android USB转ttl串口

Dialog dialog = new AlertDialog.Builder(MainActivity.this)

.setTitle(“提示”)

.setMessage(“您的设备不支持USBhost”)

.setPositiveButton(“确认”,

new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface arg0,

int arg1) {

System.exit(0);

}

}).create();

dialog.setCanceledOnTouchOutside(false);

dialog.show();

}

getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);//保持屏幕常亮状态

writeBuffer = new byte[512];

readBuffer = new byte[512];

isOpen = false;

activity = this;

//打开流程主要步骤为ResumeUsbList，UartInit

openButton.setOnClickListener(new openButton());

openButton.post(new Runnable() {

@Override

public void run() {

openButton.performClick();

}

});

handler = new Handler() {

public void handleMessage(Message msg) {

String str = msg.obj.toString();//设备回来的数据

String s0 = str.substring(0, 8);

if(s0.equals(“01 03 09”)){

//String s1 = str.substring(9,23); /*卡号/

String s2 = str.substring(24,35);/*余额/

int i = Integer.valueOf(s2.replaceAll(" “,”"),16);//转换成分

String s = String.valueOf(i/100); //转换成元

synthesizer.showVideo(“您的卡上余额为:”+s+“元”);

}

readText.append((String) msg.obj);

}

};

}

class WriteButton implements View.OnClickListener{

@Override

public void onClick(View v) {

byte[] to_send = toByteArray(writeText.getText().toString());

int retval = MyApp.driver.WriteData(to_send, to_se